Any ideas what might be causing this visual glitch in the Finder?

Recently I have this ‘artifact’ in the corner of the Finder:

I don’t know what causes it, but when I restart my Mac it goes away temporarily, and then returns. I’m running the latest OS, so there’s nothing in terms of the system to update. Not really sure how to troubleshoot this, but if anyone has any ideas I’d appreciate it. Thanks!

I had it yesterday. I quit Carrot Weather and it went away. Carrot was on the same display as the ‘artifact’. The ‘artifact’ was only on the display Carrot was on, I have multiple displays, and only the space Carrot was in, I have multiple spaces.

After relaunching Carrot it did not return.

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Immediate solution—thanks, @MevetS!

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